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Field values disappearing when saving in incremental mode.
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richard  
#1 Posted : Friday, September 11, 2020 12:16:31 AM(UTC)
richard

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Hi Paul,

I'm having an issue where field values that are added through code (when our documents are automated) are not being saved. If a value is entered manually it is saved correctly. I've narrowed the issue down to the SaveFlag. With NoIncremental it works and with Incremental it does not.

My colleague raised this same issue two years ago - https://forum.patagames.com/posts/t462-Save-and-Save-field-values-not-working.

Previously all our PDF documents have been saved with the NoIncremental flag. However, we have a new type of form which will need to be filled out by many end users. As such, we absolutely don't want the digital signature corruption issue (https://forum.patagames.com/posts/t491-Error-message-opening-saved-document-Acrobat-reader) that occurs when saving with NoIncrement and subsequently opening in Adobe Reader.

Any idea why this happens when you save incrementally? Or is there a workaround you could suggest?

Here's how we're setting the values through code:
Code:
public IPdfField SetValue(object value)
{
	Field.Value = null;
	Field.ClearSelection();

	if (value != null)
	{
		switch (value)
		{
			case string stringValue:
				{					
					Field.Value = value.ToString();
				}
				break;

			...
		}
	}

	...

	return this;
}

Edited by moderator Tuesday, September 15, 2020 3:14:17 AM(UTC)  | Reason: Not specified
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Paul Rayman  
#2 Posted : Tuesday, September 15, 2020 3:09:53 AM(UTC)
Paul Rayman

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Try this
Code:
Pdfium.FPDFOBJ_SetIsModified(field.Dictionary.Handle, true);


or even this

Code:
    field.Value = "test value";
    foreach (var ctrl in field.Controls)
    {
        Pdfium.FPDFOBJ_SetIsModified(ctrl.Dictionary.Handle, true);
        IntPtr normalAppearanceStream = Pdfium.FPDFAnnot_GetAppearanceStream(ctrl.Dictionary.Handle, AppearanceStreamModes.Normal);
        Pdfium.FPDFOBJ_SetIsModified(normalAppearanceStream, true);
    }
    doc.Save(@"e:\35\signed_changed.pdf", SaveFlags.Incremental);


If that doesn't help you, please provide a PDF document and a simple console application. I will check it on my part.

Edited by user Tuesday, September 15, 2020 3:12:15 AM(UTC)  | Reason: Not specified
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thanks 1 user thanked Paul Rayman for this useful post.
richard on 9/23/2020(UTC)
richard  
#3 Posted : Wednesday, September 23, 2020 3:22:27 AM(UTC)
richard

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Posts: 25
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Thanks Paul, you've done it again!

For those playing at home, I had to use the second option.
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